Classification and application of flow meter

Abstract: The classification and application information of flow meters are provided by excellent flow meters and flow meter manufacturers. In today's flowmeter market, there are many types of flowmeters with different performances. This makes it difficult for buyers to select the flowmeter. Before selecting the model, we need to understand the main types of flowmeters and the main performance of each variety. The most commonly used flowmeter classification. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the classification and application details of flowmeters. In today's flowmeter market, there are many types of flowmeters with different performances. This makes it difficult for buyers to select the flowmeter. Before selecting the model, we need to understand the main types of flowmeters and the main performance of each variety. At present, the most commonly used flowmeter classification methods mainly include: differential pressure flowmeter, positive displacement flowmeter, differential pressure flowmeter, float flowmeter, turbine flowmeter, electromagnetic flowmeter, and vortex flowmeter in fluid oscillating flowmeter. The principle and characteristics of various flowmeters are briefly described respectively. 2. Differential pressure flowmeter: C# p# {) l+ u7 `( K' Differential pressure flowmeter is installed through the differential pressure generated by the flow detection element in the industrial pipeline, and the known fluid conditions and detection components are connected with the pipeline. Geometry to measure differential pressure flow calculation flowmeter.* h; R L8 n: a6 W; T Differential pressure flowmeter consists of primary detection parts and secondary instruments (differential pressure converter or transmitter and flow display instrument) Composition. Differential pressure flowmeters are classified in the form of detection parts, including orifice plate flowmeters, Venturi flowmeters, uniform velocity tube flowmeters, etc. Secondary instruments are various mechanical, electronic, and electromechanical integrated differential pressure flowmeters , Differential pressure transmitter and flow display instrument. Differential pressure flow meter is the most widely used one in the flow meter family. At present, it has been serialized, generalized and standardized at home and abroad. Differential pressure flowmeter can be It can measure the flow parameters alone, and can also measure other parameters (pressure, level, density), etc. The detection parts of the differential pressure flowmeter can be divided into: throttling device, hydraulic resistance, dynamic pressure head type, dynamic pressure There are several types of head gain, jet type, and centrifugal type. There are two types of detection parts: standardized type or non-standard type. Standard type detection elements are designed, manufactured, installed and used according to standard documents, and can be determined without real flow calibration. Its flow value and estimated measurement error. Non-standard detection elements are generally not included in the international standard detection elements. Differential pressure flowmeters are also the most widely used flowmeters, occupying the first place in the use of various flowmeters. 5 w) m6 p- B9 l5 N ​​The main advantages are: (1) The most widely used orifice plate flowmeter has a firm structure, stable and reliable performance, and long service life; (2) It has a wide range of applications, and so far (3) The detection piece, transmitter and display instrument are produced by different manufacturers respectively, which is convenient for production with economies of scale. The main disadvantages are: (1) The measurement accuracy is generally low; (2) The range is narrow, generally only 3:1 to 4:1; (3) The requirements for on-site installation conditions are high; (4) The pressure loss is large (referring to the orifice plate, nozzles, etc.). * }1 m, E6 y! J. M5 I0 k$ ^- ~8 / u 3. Positive displacement flowmeter 1 O0 ], H) X4 Y$ Q0 X6 u1 f$ J Positive displacement flowmeter, also known as Displacement flowmeter, referred to as PD flowmeter, is the most accurate type of flowmeter. It uses a mechanical measuring element to continuously divide the fluid into a single known volume portion, and measures the total volume of the fluid based on the number of times the measuring chamber is repeatedly filled and discharged. Positive displacement flowmeters are classified according to their measuring elements: oval gear flowmeters, rotary piston flowmeters, reciprocating piston flowmeters, disc flowmeters, wet gas meters and bellows gas meters, liquid-sealed rotary drum flowmeters, etc. 5 r6 P8 @9 |6 D9 o' k9 n% Main advantages: (1) high measurement accuracy; (2) installation pipeline conditions have no effect on measurement accuracy; (3) can be used for the measurement of high viscosity liquids; (4) range (5) The direct-reading instrument can directly obtain the accumulation and total amount without external energy, which is clear and easy to operate. 7 W4 v! R; {5 g' b3 m/ i; n Main disadvantages: (1) The results are complex and the volume is huge; (2) The type, diameter and working state of the medium to be tested are limited; Suitable for high and low temperature occasions; (4) Most instruments are only suitable for clean single-phase fluids; (5) Noise and vibration are generated. 4. Float flowmeter A rotameter, also known as a rotameter, is a type of variable area flowmeter. In a vertical conical tube that expands from bottom to top, the gravity of the float with a circular cross-section is supported by hydrodynamic forces. , so that the float can rise and fall freely in the cone. Float flowmeter is the most widely used type of flowmeter after differential pressure flowmeter, which is suitable for small flow monitoring.

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